During a particular stage of the growth of a crop, consumptive use of water is 2.8 mm/day. If the amount of water available in the soil is 25% of 80 mm depth of water, what is the frequency of irrigation?

9 days

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13 days

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21 days

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25 days

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Solution

The correct option is C 21 days
Water available to the soil $= \frac{25}{100} \times 80 = 20 m m$

Additional water required $= 80 - 20 = 60 m m$

$∴$ Frequency of irrigation $= \frac{60}{2.8} = 21.43 d a y s$

Thus the crop should be irrigated after every 21 days.

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During a particular stage of the growth of a crop, consumptive use of water is 2.8 mm/day. If the amount of water available in the soil is 25% of 80 mm depth of water, what is the frequency of irrigation?

The correct option is C 21 daysWater available to the soil =25100×80=20 mm Additional water required =80−20=60 mm ∴ Frequency of irrigation =602.8=21.43 days Thus the crop should be irrigated after every 21 days.

The correct option is C 21 days
Water available to the soil $= \frac{25}{100} \times 80 = 20 m m$

Additional water required $= 80 - 20 = 60 m m$

$∴$ Frequency of irrigation $= \frac{60}{2.8} = 21.43 d a y s$

Thus the crop should be irrigated after every 21 days.